It is not from a production system (YET), they told me to put this in production when I upgrade this to 9i in 2 weeks time. So I dont have Statspack whatsoever. They say is to prevent performance problems, i.e being proactive than reactive :-O
Maybe 2-statspack reports can help to measure if the change of DB-Writers has any effect on database performance.
1 before change, 1 after change
SMIC / BJ-IT / SDBS
-----原始邮件----- *发件人:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx ]*代表 *K Gopalakrishnan *发送时间:* 2006年9月6日 17:05 *收件人:* ax.mount@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx *主题:* Re: excessive number of db writer
Did you get an explanation for those suggestions? It would be difficult for us to comment on those changes without any additional details..
However, However,However, 20 DBWriters are certainly high for your configuration ;)
Have a nice day !! ------------------------------------------------------------ Best Regards, K Gopalakrishnan, Co-Author: Oracle Wait Interface: Oracle Press 2004. http://www.amazon.com/gp/product/007222729X/
Coming Soon: Oracle RAC Handbook, Oracle Press 2006 http://www.amazon.com/gp/product/007146509X/
----- Original Message ---- From: amonte <ax.mount@xxxxxxxxx> To: oracle-l@xxxxxxxxxxxxx Sent: Wednesday, September 6, 2006 1:39:51 AM Subject: excessive number of db writer
I have been suggested by some Oracle Consultant to set 20 Database Writer in a 12 CPU HP-UX Server.
Does anyone know what are the side effects of having excessive DBWR? I detected a higher CPU usage (between, 1% to 2%) not sure if its due to the number of Database Writer. Because when I increased the number of DBWR at init.ora I also changed these parameters
_row_cache_cursors = 60 _kgl_latch_count = 59 _kghdsidx_count = 4 statistics_level = basic
again suugested by this guy.